Tootfinder

Improving Online Bin Covering with Little Advice
Andrej Brodnik, Bengt J. Nilsson, Gordana Vujovi\'c
https://arxiv.org/abs/2506.09004 https://

Improving Online Bin Covering with Little Advice
The online bin covering problem is: given an input sequence of items find a placement of the items in the maximum number of bins such that the sum of the items' sizes in each bin is at least~1. Boyar~{\em et~al}.\@~\cite{boyar2021} present a strategy that with $O(\log \log n)$ bits of advice, where $n$ is the length of the input sequence, achieves a competitive ratio of $8/15\approx0.5333\ldots$. We show that with a strengthened analysis and some minor improvements, the same strategy achieves t…

Quantum cosmological perturbations in bouncing models with mimetic dark matter
Idaiane L. Machado, D\^eivid R. da Silva, Nelson Pinto-Neto
https://arxiv.org/abs/2506.06901

Quantum cosmological perturbations in bouncing models with mimetic dark matter
We calculate the power spectrum of cosmological perturbations originated from quantum vacuum fluctuations in bouncing scenarios proposed in Ref.~\cite{chamseddine2014cosmology} in the framework of mimetic cosmology. We show that all physically relevant models produce scale invariant spectral indices, and amplitudes compatible with observations provided that the bounce occurs at length scales $t_0$ inside the physically reasonable interval $10^5 l_p < t_0 < 10^9 l_p$. We also show that by slight…

Die re:publica hat dem Boomer Stefan emotional und inhaltlich eine Menge gebracht. Sie hat mir Mut gemacht, da sich viele junge Menschen engagieren. Doch natürlich sind da auch Fragen und Sorgen. Der besonders persönliche Teil 3 meiner #rp25-Impressionen.

Nicht nur Generation XYZ auf der re:publica 25: Zwischen Boomer-Nostalgie, Jugendpower und persönlichen Treffen
Die re:publica hat dem Boomer Stefan emotional und inhaltlich eine Menge gebracht. Sie hat mir Mut gemacht, da sich viele junge Menschen engagieren. Doch natürlich sind da auch Fragen und Sorgen. D…

Calamus 15 O drops of me!
It's a remarkably morbid poem for Whitman, literally about blood dropping from wounds, corrupting his poetry.
stain every song I sing, every word I say, bloody drops
But he turns this blood into a sort of virtue that infuses his poem, starting with an inversion. It's not "saturate yourself with the drops". Instead it's saturate them with yourself.
Saturate them with yourself, all ashamed and wet,
Glow upon all I have written or shall write, bleeding drops,
Let it all be seen in your light, blushing drops.
I can make a case for a queer reading of recognizing gay shame and overcoming it. To take the stigma of homosexuality and turn it into a virtue, "let it all be seen in your light".
But I think I may be out on a limb with that interpretation. Whitman's not typically a writer about shame. And I think "gay shame" doesn't apply well as a concept in the 1850s, that's a malady that comes with a backlash against modern gay identity.

Polarized Neutrons at ISIS: Recent Developments And Highlights
Polly Mitchell, Holly I. Barnfield, Mark Devonport, Kirill Nemkovski, G{\o}ran J. Nilsen, Peter Galsworthy, Gavin B. G. Stenning
https://arxiv.org/abs/2506.05148

Polarized Neutrons at ISIS: Recent Developments And Highlights
We present two recent projects which aim to improve the performance of polarized neutron scattering experiments using hyperpolarized $^{3}He$ spin filters at ISIS. The first is the optimization of a new compact magnetostatic cavity ("Magic Box") to house the $^{3}He$ spin filters based on an existing design. With a length of only 380 mm, it provides a field gradient relaxation time for the $^{3}He$ cell of 421 h in ambient conditions. It also contains a radiofrequency coil for adiabatic fast pa…

Computer scientist Greg Nelson and I presented "Following AI's Footsteps from School to Society" at the 2025 UMaine Faculty Institute https://mycampus.maine.edu/web/uc-faculty-portal/faculty-institute-2025 including the IMPACT RISK framew…